Deciphering the structural evolution and real active ingredients of iron oxides in photocatalytic CO_(2)hydrogenation  

作　　者：Mengjun Zhao Yuhao Guo Na Li Tingjiang Yan 

机构地区：[1]Key Laboratory of Catalytic Conversion and Clean Energy in Universities of Shandong Province,School of Chemistry and Chemical Engineering,Qufu Normal University,Qufu,273165,PR China [2]College of Chemistry and Chemical Engineering,Shaanxi University of Science and Technology,Xi'an,710021,PR China

出　　处：《Chinese Journal of Structural Chemistry》2024年第8期27-37,共11页结构化学（英文）

基　　金：supported by the National Natural Science Foundation of China(Nos.22172086,22105117);Taishan Scholars Program of Shandong Province(No.tsqn202103064);the Major Basic Research Project of Shandong Province(No.ZR2021ZD06).

摘　　要：Photocatalytic CO_(2)hydrogenation reactions can produce high-value-added chemicals for industry,solving the environmental problems caused by excessive CO_(2)emissions.Iron oxides are commonly used in photocatalytic reactions due to their various structures and suitable band gaps.Nevertheless,the structural evolution and real active components during photocatalytic CO_(2)hydrogenation reaction are rarely studied.Herein,a variety of iron oxides including a-Fe_(2)O_(3),y-Fe_(2)O_(3),Fe_(3)O_(4)and FeO were derived from Prussian blue precursors to investigate the CO_(2)hydrogenation performance,structural evolution and active components.Especially,the typical a-andγ-Fe_(2)O_(3)are converted to Fe_(3)O_(4)during the reaction,while Fe/Fe_(x)O_(y)remains structurally stable.Meanwhile,it is confirmed that Fe_(3)O_(4)is the main active component for CO production and the formation of hydrocarbons(CH_(4)and C_(2)-C_(4))are highly dependent on the Fe/Fe_(x)O_(y)heterojunctions.The optimal yields of CO,CH_(4)and C_(2)-C_(4)hydrocarbons over the best catalyst(FeFe-550)can achieve 4 mmol g^(-1)h^(-1),350μmol g^(-1)h^(-1)and 150μmol g^(-1)h^(-1),respectively due to their suitable metal/oxide component distribution.This work examines the structural evolution of different iron oxide catalysts in the photocatalytic CO_(2)hydrogenation reaction,identifies the active components as well as reveals the relationship between components and the products,and offers valuable insights into the efficient utilization of CO_(2).

关 键 词：Iron oxides PHOTOCATALYSIS CO_(2)hydrogenation Structural evolution 

分 类 号：O643.3[理学—物理化学]